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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e4d8819af42ff5f88f737f3070cbff439f13a9a79f726bd98092cd2b96ed69' 
  AND token = 'jfz/KikyHnNSKzVQEv0c16YOm5q7T8XuDAe+2KeDcng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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