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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d51c867f7ae57feb58a49ec988d95f96f09507f1277d8cc8f8a478af23ad5d' 
  AND token = 'vCs59dOhTrJMMfvD69si/e2Jzkhyc+hftnMlYxQMHEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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