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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b5b81ee6c5c5da1a37d08161217e3831f125f97515e327f7827e5151355781' 
  AND token = 'JJ5j/MuzJ+HTffBEke0H6yZLfWxpuSGajutCRAsxYXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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