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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b0739beb48e74962730f0e4ee215d985e13f4159a7635fc8dd465806973685' 
  AND token = 'o4Cj+H5v+gS31TZ2lPng5YIaIZwvIjyyzOckEv9po+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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