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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be6438fc662667fdfbdab980f7ae45a401fc98bd263d037c7a1b0f5a9d8df98' 
  AND token = 'RZ1es+9jHWjGfD4BtV46CxJguWXHAHLNJ8SQtk8LUA8=' 
  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"
    }
  }
}