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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e169086fcc48477e6b0729ee01340132a7da476343f1ddc5f2773d247d2f1d33' 
  AND token = 'm3W+FS6urulzXpkjZz+3pB5uxg3pRouRNz0O1luN2bA=' 
  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"
    }
  }
}