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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7871d4d916d54386f9d2476f398ee68fd71a67d12817f6c58ce9e0b900acd8e' 
  AND token = 'zZkoBXMpdaAswyZBwJcJ1SrsNGbGkHW4P54lXzC3d9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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