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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8599d73550798b17a70b6749f8c511783a553ecf90b73e44fddc5ca1be914a88' 
  AND token = 'QGU4AhpMyePTQ/gJdbvOS7aGUiFJ+PQGNkmG5js41ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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