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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e7bcfe6e863b8ac9cd041bfa95db12d7b99667695148375ad2fa9d4b85e65e' 
  AND token = '2T6f5+I2R0oNBLgWaHLgCmU64z1KijbbFxCQmyundbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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