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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e28ae78ee433b31165c61b585407f491230a71eaaa5eb138a7f8c574b2c76c6' 
  AND token = '6CjCdgi8vDakvg3ZIWcKym285VYD25i9w5RFRNHxwxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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