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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2391ba3fdd98f10af24b62feadf6aacee23e8dcf2b20c672a5eb9cb8c9be01' 
  AND token = 'jUzdGNgk/O+CLa5Q2qAutF+dRzXpRPBTK2TyiQu66Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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