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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60733f330606735fabe0c71f53ee4e2dad31e8d7816c860e44203a65d1b6bab5' 
  AND token = 'tLbiQXZvMdUqZxsuXw/NQ8V6cub6i9ry10cSyET3Qu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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