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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cb88e543f64fa20824ea77cbf8ef75d3b437aa2e78d6eb6517b795ca63e127' 
  AND token = 'PSWOq7U3vCKSSyjmhLtAXGeNzlTbTTB4BPceumQCnzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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