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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bec1ab74e55380fc9f3a231131f1c13f6a72a0b9c52503ba37749d0dc3e98d7' 
  AND token = '/kWlgWSKrDqFdoZsc/13a9zcQ3ARj3vvyBV+eqgw3kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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