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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f009d1b09cc26b2f31f2b57a2620c3d305cfce01337a2c8ac07a23820065dd' 
  AND token = 'f+lMadzKe2ptdOyJniLKW2zdHI1FKf3/h+vpDJwAhNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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