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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0f668265674d7ee5632f7344fc885cd1a820c83eff2678d1b75d0735a7c0fc' 
  AND token = '2r78Hin9n1l6J0kf1f0J9OXrfKtX7MSr6dLSqA+RABM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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