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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989b0d5d7073d6c258b732d91a1ace455ece70f25361098fcd181d726f6611f4' 
  AND token = 'RAsotLvaSXOs7M+8kWThTnMgFKiGnKFDz+mwkyra0WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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