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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320cc32e6e57476f9f44d0dc8f09dd7240b17df68a522ea58fdb353e94412d6e' 
  AND token = 'J53w5BO1a0SOVeXj1ofBTj3239rDm5HiJSTLKwK7IvM=' 
  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"
    }
  }
}