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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c57a731a55dc4e464326e41c9c500f7eddab973d25374d2e25214eedeaa087' 
  AND token = 'fTNxS3ezNPMnql5msGboP+7k0d1rnjiuABbeZi9/HiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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