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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4af363c78e7c4acfa55001da97510b91fb8e95b66cf3e5b65cfd4da276c45f4' 
  AND token = 'PQTlqp4poQPFZ0IFFGpD35zjE97USHCq+NRN1gypl9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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