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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a443f5045a8d1e257457f7356877e506af6647abe2c0a8b56ab8f00a8c260d' 
  AND token = '0V3dWIWAfPauJi2ZlSLJF8WHjeYS1w/+II4XSZiriZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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