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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d624f66a60074ca799ec517c313c999f574d1193f2689862635804bc07df7a' 
  AND token = 'W3+GKJx/y4FK/JDjHTDDzXMDyBcseZYdLm0aIf0NAs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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