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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa8364c57913118cb398302b0a233117bb17f7b3a717e27cb8224d571fb0306' 
  AND token = 'emEPHHbqVxkQWpPuWH0anhNoSckGiP8szCAE+ewOnfg=' 
  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"
    }
  }
}