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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bcb815f87d5ff5e5a07f95c07dfb52c13566cd33491c4aaf0fe41350936779' 
  AND token = 'tu9nKkO09Ril7a1v3hXzEGrx83mba/VblRANbIJB+tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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