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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01d29dadf8627346781d88b1a2e1fc6bcaf1eccc1f814420d45adc353fc99e72' 
  AND token = 'QOcGdUReUKAN6plgVBsTDbFY1Av9tRaJL+Xod5FueIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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