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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ffc684ce323b49e94f2a38909db0113ccd0ce87cff5b030c79ccc186436c04' 
  AND token = 'RgOs8wNjZ1mbGCMcfJu3N9y+UHn/nu4kZfA9+05L5H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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