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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4a064e941bd23083771354d67340e756af04824dfe038c45071dfd8d2877c3' 
  AND token = 'XT6X5P8pia2c8jSyKcCm5ueQdo9xFwY8z0i9ezot55w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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