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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11483b783fee50993332aa4934c98e42a1a6f7d4afd05a0541e0501c219a3b97' 
  AND token = 'Rp8Y9NfSC5EPwTxby7gRvyyZKfEtCSDClNXIacRL8mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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