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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410145962fd672ca015ca3488ab5898f0f9849dc0bd55ee195b6e31d862a6198' 
  AND token = 'Tc9Ae/5aL7d2kr0SAHg52HuJFFTE5OYUcaHOlp+sLVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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