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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d64b50389479d47ff61835bcd9ea0a89bef31f56cbad117e4681719f9e30a6e' 
  AND token = '4raCb67hyvns9s59dgqEIEEL1pxx7LBtrSBLLpNpdd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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