SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323be06480472bd1f762bc4a4286d0d4bba3169aa8914039f2e5e4c846f6476e' 
  AND token = 'aEGH6oDIw5R4nTOn9tjJcgM+as9pp3zkBuqFp+zvPYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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