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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f69e3bd094fac3bf1db0f5fc56661eb6cd937f1278bf1c3d097501be6eb829' 
  AND token = 'y1HoMYvkeFfKsHeVg4g6eUN5pddm7ppje0R+Onsy0CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}