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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec3dd66fe69c45900effabea442f8b3bbf40114053b0a5a887bff919e2b7919' 
  AND token = 'NGLiQdHKvNSt7IrF5Bo9bMjPNBqmHeJSglz5X6pQLCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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