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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1675f9a4401204be46d1abe42af1028cfb73b864a855c01950e734eb0d19c9e6' 
  AND token = '83v7zvA4qprl3RO7YVslJMy5BQkdSpGep+WDbyGQypE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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