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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7a459b265a6071ba8b6535a057dbd3ff4afe26a35e4c0d796da28e76ff9d15' 
  AND token = 'HOyzaE9NVIQ1sI4dWkR/vNSYI8oye1FFvDg2RY8R+Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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