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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a8c84f0a7c83a6418ee6233032f0293887a848fecf2c3da802653c8394a847' 
  AND token = 'Tkb/JfGXOUexkYVsZfiIG22ISD3H/uR3r9GP1qW9UjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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