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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a33b7d7fd13e4a73f09241f1905273318acc0e31797a467d56d789e1c02f7c4' 
  AND token = 'quF3KkT412aGj0Eyab1XzrueIv07aRh2yKesSVOU9/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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