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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb6ceb1b8c76a56b5e2947a201e19ffe45badf7e5d18a24557f979703ce94ee' 
  AND token = 'sqCX1uuciahoRMcIxWlK+IteuBQhZ5dzVwgh16hE6m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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