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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09ec153a16ce8bc13a94f54972fb687fbc064b66fa6ea8277d930f768250443' 
  AND token = 'DvSdr6J08pD6WrYc49oiOFxXkuo+1M1gTj8lPxId6fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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