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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a915a8a73fd51eb376fb0be00fa55af8109215678c97093b544fe111a5b66ec7' 
  AND token = 'm3X170AtIClrZu+13/aUVcFgr38pJQdPyFzL5CCAHJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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