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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460d390a4a23a552f97e520e08fbf36bb52fca60b9e5559c19259cb403deaa61' 
  AND token = 'zPvo7gYsL2tLVFKOs5xg/v+bggY60zMgDiEX1AcQE9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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