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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb266c825c86eb53e17fe0b07e87aa786a5631fd3a92976babf57f54b68d9a9' 
  AND token = 'yVYu+ekjhNmm0bfPsWF5LyO3FGGz23khMp4nj/wiTdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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