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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0235b7cb595d048ca95975db9d68247e21f1df1174f01e65fb1900f8f4bd738' 
  AND token = 'RRMtv60OZV5k9qpkIhbjRNADQJaONME/EY1+bRUIuu0=' 
  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"
    }
  }
}