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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01e331d4e1abdb85ae3854860851f2e7818d3f98184852820c138b72123f9ac' 
  AND token = 'w3rb12pj0FpFZ1q099AnVq+5troMg5A/XLguZY9kiYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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