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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1672c0f97114e18f27d1bdd09a0e28618d1689100a8e2cd13305b31890bb58' 
  AND token = 'PS0vN+eE6koOtXVL9+BwVyXc5LKKbmhKZfmqWO3c87Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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