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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b845b4f42ae107f4778fb694e5aa3f7ab6174ba562b5633a0e7bfd40ab889d09' 
  AND token = 'k8oQMKJ+wDWJshFLw1DBw29SuX/SB8W4fNH1ZDyYO2A=' 
  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"
    }
  }
}