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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba51dc01d7db6db7b8760b95816d60ad6e199b7bf0e412e8e8cc83d9897f18d' 
  AND token = 'j4Qb5LfhAZ9EzDXkcfiIIzJujseUP4DZOBrr0H38xvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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