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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62c5c10af457056c30474fe8a9536a9630d92a340b3f7712db61515fad074ef' 
  AND token = 'c1GOmKU1Ywaa1YE6rpTaSGDyPjDZ3LL8+D04FuAt1Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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