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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8566d4696341644d08a6cb5b699133b03433b0842aa0302d186d59e9c391be78' 
  AND token = 'ovrykC4SeOGc7K8U95Ec+zxqTYViy7opiTF7IO/cnc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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