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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae16e6f7f2f3428a34c607022a3aad838997ed93ac9f27f196fad77e7930a6a0' 
  AND token = 'oaG2wvzdAlNnP+RlM18ccSB3qnN73kw2KM5xiN9Qn58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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