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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90d5c689b84f5bef886e51eb9866454049eec81cad662ec2338a305c1430a4c' 
  AND token = '+Ckat7THbI3ISF60YtTPyXv98u1ZQ345erazgCHfYHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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