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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846ff4269ad3712acb7bad5e4c9503b4ea60d115a69df511d9085d74c0f15cb9' 
  AND token = 'urtsz4Gg5xVP+6C/QObU7BboEtXyrRHc9s7YcHg2b4M=' 
  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"
    }
  }
}