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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66c119e3a1e710ec01f1b7ad915be7bf67fc433135416309759b4a0d6fc61cf' 
  AND token = 'xxnFtbLjY1DnSlvQGjUhJyHw00qGxYCr0KTL022tJno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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