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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84eb3d6e2bb35d2da22d6e942da3449f995a284cb74e6b416cc3ef56a6c1a5b' 
  AND token = 'JCF70DlTjWLAoISwsOeffjfpjuY/OZQewJfeOnvtx5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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