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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '278e80274370f72cea5c8cd3b621c9b39532957a3e37b58a41a7ad49f49ca871' 
  AND token = 'qg1Zz5CDk/Ja+heZbAftAubflx2uMx/8DYsRW3P8PtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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