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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9562ac449761921e74153ea75d224d9efcfc3502d0da760cd7782e3b478a0ca1' 
  AND token = '5VInYI6EsCmuuxBz/SLI0Y4k09ElmigGRthLIFW3bG0=' 
  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"
    }
  }
}