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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a6eb52cf13b12460664d130636182b12982766c6f45455e2d6f66e7a0e0c17' 
  AND token = '6vtvkXMMaUrkChJ99Kjcj3/0lRo/C3iGtPhXLrKv8o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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