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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352712b4443ba1988a7ce0f9378137f79bf8b9a90ef52eef785d761e5674c3af' 
  AND token = '89jBO4EQm2CqBrjclQR+zt2H14TNQ5T1v68t3dSn43k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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