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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56bc0f6295dfbda3e53734c9429c481606d53c3133fb39d758be12ea3f359efa' 
  AND token = 'Vw9hUScdBIl8adCDulO3X0ijIG8A/0DzyCn2v9TwsQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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