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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff2c47d6bf6e4397dc15040c7e4662fe5239e4dd1a13c42d3dbd795e4fcf128' 
  AND token = 'rVpvuT6MTUmIpX3LVLSKlT99SsrO3V1J5RDgxrCFJZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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