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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585075b8d63287a5f997222c7627db2b39f0699db728b7b1a026dd1e5b7e2da7' 
  AND token = 'bZUcKFcnBHUMkVXCYe8lkoXwDX1Jlqcz2PKO1fujaJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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