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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5f5bc49960bdf4b410ff489db78f0e0e1c85f59f7b29647f9d27391bab0e9a' 
  AND token = 'T+AFBqUxW6z0+Eyfxc403iZQCu3s3buiGTxtVvKvqPw=' 
  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"
    }
  }
}